Need context. Show the code for the class where you are trying to use this line (with the line in it as you tried it). Please see the link below the reply box on posting code before posting any code.

That's not a complete error message. There should be a comma between the two parameters.

In the world class, there is a method called 'setPaintOrder'. To use it, you would use it like this: So without the 'public void' and with a comma. If you want to create a method which you name 'setPaintOrder' for some reason and it has a Hero and a Background object as parameters, then it would look like this: But since you have a semicolon after your line, I guess you just want to call that method, so remove the 'public void' and add a comma.